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什么是低温脆性？低温脆性是指材料的冲击吸收功随温度降低而降低，当试验温度低于Tk(韧脆临界转变温度)时，冲击吸收功明显下降，材料由韧性状态变为脆性状态，这种现象称为低温脆性。
What is low temperature brittleness? Low temperature brittleness means that the impact absorbed energy of material decreases with the decrease of temperature. When the test temperature is lower than TK (critical transition temperature of toughness and brittleness)， the impact absorbed energy decreases clears， and the material changes from ductile state to brittle state. This phenomenon is called low temperature brittleness.
现在，一些小的宾馆或一些建筑物的部分商业、办公区域也需要用到采暖和生活热水，ppr管件规格，他们的热负荷或生活热水用量要比家庭大许多（即并联安装若干台燃气壁挂炉）；因此热水管的管径比较大，在与集分水器、隔离罐、控制附件等连接时需要用到法兰连接。
Now， some small hotels or some commercial and office areas of some buildings also need heating and domestic hot water， and their heat load or domestic hot water cost is much larger than that of families (that is， several gas-fired wall mounted boilers are installed in parallel); Therefore， the diameter of the hot water pipe is relatively large， and flange connection is needed when connecting with the water distributor， isolation tank， control accessories， etc.
PPR管格与管件连接端面必须清洁、干燥、无油。
用卡尺和合适的笔在管端测量并标绘出热熔深度，杨浦区ppr管件，热熔深度应符合下表规定：
熔接弯头或三通时，ppr管件，按设计图纸要求应注意其方向，在管件和管材的直线方向上，ppr管件品牌，用辅助标志标出其位置。
The connecting end face of PPR pipe lattice and pipe fittings must be clean， dry and oil-free.
Measure and plot the hot melt profundity at the pipe end with a caliper and a suitable pen. The hot melt profundity shall meet the requirements of the following table:
When welding elbows or tees， the direction could be noted according to the requirements of design drawings， and the place shall be marked with auxiliary marks in the straight direction of pipe fittings and pipes.
